[PATCH v16 1/8] perf config: Collect configs to handle config variables

Collecting configs into list because of two reason. First of all, if there are same variables both user and system config file, they all will be printed when 'list' command work. But if config variables are duplicated, user config variables should only be printed because it has priority. Lastly,

[PATCH v16 1/8] perf config: Collect configs to handle config variables

Collecting configs into list because of two reason. First of all, if there are same variables both user and system config file, they all will be printed when 'list' command work. But if config variables are duplicated, user config variables should only be printed because it has priority. Lastly,